marine iguanas gathering, the `imps of darkness` look like small dragons,fernandina island, galapagos

1835 algae animal armour attention beagle cape caught charles crest darwin display diver diving douglas dragon endemic evolution evolves feeding fernandina fierce galapagos gargoyle gathering grin grows habitat iguana iguanas imps island lava lizard marine mouth natural nature ocean pacific rocks salt scales selection species spines spiny underwater unique world